CN100396098C - Vehicle video triggered equipment and method based on fast algorithm of locating license plate of vehicle - Google Patents
Vehicle video triggered equipment and method based on fast algorithm of locating license plate of vehicle Download PDFInfo
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- CN100396098C CN100396098C CNB2004101029338A CN200410102933A CN100396098C CN 100396098 C CN100396098 C CN 100396098C CN B2004101029338 A CNB2004101029338 A CN B2004101029338A CN 200410102933 A CN200410102933 A CN 200410102933A CN 100396098 C CN100396098 C CN 100396098C
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Abstract
The present invention relates to a vehicle video triggering device and method based on a fast vehicle license plate positioning algorithm, which belongs to the technical field of electric communication. The purpose of the present invention is to solve the false triggering phenomenon of a virtual coil in the vehicle video triggering method. The present invention has the technical proposals solving the technical problem that a digital video encoder collects each field of video image of a vehicle and stores the video images into an FIFO memory; meanwhile, a high-speed digital signal processor is utilized to collect as well as scan line data in the memory to store feature points of each line. After the line feature scanning is finished, the fast vehicle license plate positioning algorithm is utilized to primarily position a vehicle license plate by aiming at the feature data. In the end, the vehicular original image features stored in the FIFO memory are contrasted to eliminate farraginous zones and correctly position the vehicle license plate for triggering video. The present invention has the advantages that the vehicle video triggering device and method overcomes the existing video false triggering phenomenon and utilizes the working speed difference between the fast vehicle license plate positioning algorithm and video collection hardware to finish positioning the vehicle license plate; the vehicle video triggering device and method accurately positions and has little false triggering probability.
Description
Technical field
The present invention relates to a kind of vehicle video triggered equipment and method, belong to the technical field of telecommunications in the International Classification of Patents electric department based on fast algorithm of locating license plate of vehicle.
Background technology
Along with the develop rapidly of intelligent transport technology, the vehicle detection technology has been applied to the every field of intelligent transportation system widely, as city bayonet socket, expressway tol lcollection, urban road vehicle traffic statistics or the like.At present, mainly rely on outer contacting transmitting apparatus and video triggered equipment to realize vehicle detection.But the outer contacting transmitting apparatus usually needs to destroy the road surface to be installed, and along with the distortion on road surface causes the damage of device, brings many constantly to maintenance, and there is limitation in the infrared triggering of himself and laser triggering technique, usually follows the false triggering phenomenon.Video triggered equipment is emerging in recent years technology, adopt the virtual coil technology, its shortcoming is that adaptive capacity to environment is poor, be subjected to the interference of light easily and produce false triggering, come into view or the like as light variation, other non-vehicle objects, from present practical application, the false triggering rate reaches about 30%, is difficult to real the use.
Summary of the invention
The objective of the invention is to solve virtual coil false triggering phenomenon in the automobile video frequency trigger equipment, the technical scheme that technical solution problem of the present invention is adopted is: by digital video code, push-up storage, digital signal processor becomes apparatus of the present invention with the digital signal memory set, digital video code is gathered each video image of vehicle to be monitored, analog video signal is converted to digital video signal and deposits it in push-up storage, digital signal processor carries out the limit to the line data in the push-up storage and gathers scan edge, store the characteristic point of every row, utilize fast algorithm of locating license plate of vehicle to carry out the car plate Primary Location at characteristic, contrast at last is stored in the vehicle original image feature in the digital signal processor, row's denuded zone, correct location license plate area, thereby cause that video triggers, in addition, the IMAQ control bus is finished the controlled function from digital signal processor to the push-up storage images acquired, digital signal processor operation video trigger.
Automobile video frequency triggering method of the present invention is, digital signal processor operation video trigger, and this video trigger comprises following steps at least:
Step 1., the video field signal sync break trigger to take place, digital video code begins the video image of collection vehicle;
Step 2., when vision signal row sync break trigger to take place, digital signal processor began to gather the capable image in the push-up storage;
Step 3., the capable mark scanning of digital signal processor;
Step 4., whether the system queries image is gathered finishes, and does not finish if gather, and the row sync break then takes place once more, the circulation execution in step 2. to step 4.;
Step 5., after IMAQ finished, digital signal processor scanned the image line characteristic point again;
6. step utilizes fast algorithm of locating license plate of vehicle to the car plate Primary Location;
7. step carries out vehicle license plate characteristic scanning to the original license plate image of Primary Location;
8. whether step have vehicle license plate characteristic in the system queries Primary Location feature, if there is not vehicle license plate characteristic, then returns step 1., begins next field synchronization down trigger; If have, then the row of system denuded zone is correctly located license plate area, triggers the identification car plate.
Usefulness of the present invention is to overcome existing video false triggering phenomenon, utilize the operating rate difference between fast algorithm of locating license plate of vehicle and the video acquisition hardware to finish the car plate location, adopt above-mentioned video triggering method, realized " zero-time " triggering, that is: realized that real time image collection, realtime graphic scanning, enforcement car plate location and video trigger the identification car plate, accurate positioning, the false triggering probability is little, can be widely used in the vehicle detection of intelligent transportation system.
Description of drawings
Fig. 1 is a video triggered equipment structural representation of the present invention.
Fig. 2 is a video triggering method flow chart of the present invention.
Fig. 3 is a video image acquisition work schematic diagram of the present invention.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
In the video triggered equipment structural representation of Fig. 1, apparatus of the present invention are made up of digital video code, push-up storage, digital signal processor and digital signal memory, and its concrete connected mode is: digital video code links to each other with digital signal processor by push-up storage; Digital signal processor links to each other with the digital signal memory again.The IMAQ control bus is finished the controlled function from digital signal processor to the push-up storage images acquired, digital signal processor operation video trigger.
In the video triggering method flow chart of Fig. 2, after analog video signal field synchronization down trigger takes place, digital video code begins the video image of collection vehicle, when row synchronously down trigger took place, digital signal processor began to gather 5 row images, the vehicle license plate characteristic point is carried out mark scanning handle, whether the system queries image is gathered finishes, do not finish if gather, the sync break of then going triggers once more, the circulation execution in step 2. to step 4.; After IMAQ finished, digital signal processor to the image line mark scanning, utilized algorithm of locating license plate of vehicle again, to the quick Primary Location of car plate, original license plate image to Primary Location carries out vehicle license plate characteristic scanning then, after comparative analysis license plate image and the image line feature, in the system queries Primary Location feature whether vehicle license plate characteristic is arranged, if do not have, then return step and 1. begin next field synchronization down trigger,, then arrange denuded zone if having, correct location license plate area, thus the identification car plate triggered.
In the video image acquisition work schematic diagram of Fig. 3, after first field synchronization interrupts taking place, digital video code begins the video image of collection vehicle, according to 5 line data frequency divisions, 320us consuming time stores in the push-up storage automatically, row sync break arrival this moment triggered digital signal processor is gathered 5 line data from push-up storage, that is: begin to gather with respect to digital video code time-delay 5 row, 160us consuming time, utilize remaining 160us that the capable mark scanning of 5 line data of gathering is handled before the capable sync break of the next one begins, first 5 line data that digital signal processor will have been gathered when the capable sync break of the next one arrives disposes like this; Between later per two capable sync break began, digital signal processor all was to gather 5 line data, went mark scanning again, finished until a sub-picture collection.After one sub-picture collection finishes, in the retrace interval of 2ms, digital signal processor is done capable mark scanning again to the characteristic point data of every row again, utilize fast algorithm of locating license plate of vehicle that car plate is carried out location just, and then the original image of first location carried out license plate image signature analysis, identification, row's denuded zone triggers thereby correctly locate license plate area beginning video.Therefore, begin to begin from the piece image collection to next width of cloth IMAQ, the IMAQ of digital signal processor and the time of image processing all respectively account for half of digital video code images acquired time, saved the extra time overhead of digital signal processor, realized that " zero-time " trigger, that is: real-time real time image collection, realtime graphic scanning, car plate location and video trigger the identification car plate in real time.
Claims (1)
1. automobile video frequency triggering method based on fast algorithm of locating license plate of vehicle is characterized in that:
At least may further comprise the steps:
Step 1., the video field signal sync break trigger to take place, push-up storage begins the video image of collection vehicle from digital video code;
Step 2., after the video field signal sync break triggers generation, the number of times that the capable sync break of the automatic recorded video signal of digital signal processor meeting produces, whenever the row sync break is accumulated to fixed number of times, will the triggered digital signal processor from push-up storage, gather the capable image of fixed line number;
3. step utilizes before add up interrupting beginning synchronously after the push-up storage collection fixed line number data the remaining time that the fixed line number data of described collection are gone mark scanning in that the next one is capable;
Step 4., whether the system queries image is gathered finishes, and does not finish if gather, and the row sync break then takes place once more, the circulation execution in step 2. to step 4.;
Step 5., after IMAQ finished, digital signal processor scanned 3. go the image line characteristic point that mark scanning obtains through step again;
6. step utilizes fast algorithm of locating license plate of vehicle to the car plate Primary Location;
7. step carries out vehicle license plate characteristic scanning to the original license plate image of Primary Location;
8. whether step have vehicle license plate characteristic in the system queries Primary Location feature, if there is not vehicle license plate characteristic, then returns step 1., begins next field synchronization down trigger; If have, then the row of system denuded zone is correctly located license plate area, triggers the identification car plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004101029338A CN100396098C (en) | 2004-12-30 | 2004-12-30 | Vehicle video triggered equipment and method based on fast algorithm of locating license plate of vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004101029338A CN100396098C (en) | 2004-12-30 | 2004-12-30 | Vehicle video triggered equipment and method based on fast algorithm of locating license plate of vehicle |
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| CN1798333A CN1798333A (en) | 2006-07-05 |
| CN100396098C true CN100396098C (en) | 2008-06-18 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101438681B (en) * | 2008-12-22 | 2011-03-16 | 中国农业大学 | Method and system for triggering carcass image collection based on cattle bowl |
| CN103384368B (en) * | 2012-05-03 | 2016-05-04 | 高德软件有限公司 | A kind of mobile terminal location system and method |
| CN104240512A (en) * | 2013-06-09 | 2014-12-24 | 北京智通视讯科技发展有限公司 | Control technology achieving plate number video detecting and flash shooting for vehicle recognition system |
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| US6373962B1 (en) * | 1998-04-24 | 2002-04-16 | Ume Tech Yugen Kaisha | License plate information reader device for motor vehicles |
| CN2524991Y (en) * | 2001-10-18 | 2002-12-11 | 山西伯斯特自动控制工程有限公司 | License plate automatic identifying device |
| CN1420041A (en) * | 2001-11-21 | 2003-05-28 | 北京汉王科技有限公司 | Embedded integrative vehicle licensing plate distinguishing apparatus |
| US6747687B1 (en) * | 2000-01-11 | 2004-06-08 | Pulnix America, Inc. | System for recognizing the same vehicle at different times and places |
| US6754369B1 (en) * | 2000-03-24 | 2004-06-22 | Fujitsu Limited | License plate reading apparatus and method |
| CN1529276A (en) * | 2003-10-17 | 2004-09-15 | 沈阳工业学院 | Device and method for automatically identifying registration number for motor vehicle |
| CN1532089A (en) * | 2003-03-26 | 2004-09-29 | 李春鸥 | Real-time monitoring system for motor vehicle |
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- 2004-12-30 CN CNB2004101029338A patent/CN100396098C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6373962B1 (en) * | 1998-04-24 | 2002-04-16 | Ume Tech Yugen Kaisha | License plate information reader device for motor vehicles |
| US6747687B1 (en) * | 2000-01-11 | 2004-06-08 | Pulnix America, Inc. | System for recognizing the same vehicle at different times and places |
| US6754369B1 (en) * | 2000-03-24 | 2004-06-22 | Fujitsu Limited | License plate reading apparatus and method |
| CN2524991Y (en) * | 2001-10-18 | 2002-12-11 | 山西伯斯特自动控制工程有限公司 | License plate automatic identifying device |
| CN1420041A (en) * | 2001-11-21 | 2003-05-28 | 北京汉王科技有限公司 | Embedded integrative vehicle licensing plate distinguishing apparatus |
| CN1532089A (en) * | 2003-03-26 | 2004-09-29 | 李春鸥 | Real-time monitoring system for motor vehicle |
| CN1529276A (en) * | 2003-10-17 | 2004-09-15 | 沈阳工业学院 | Device and method for automatically identifying registration number for motor vehicle |
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